practice_11

function sum(a, b) {
    return a + b;
}

function mean2(a, b) {
    return sum(a, b) / 2;
}

function arrayMean(arr) {
    let sum = 0;
    for(let i = 0; i < arr.length; i++) sum += arr[i];
    return sum / arr.length;
}

let a = 10, b = 5;

console.log(sum(a, b));
console.log(mean2(a, b));

let arr = [a, b, 2];

console.log(arrayMean(arr));